Write the uses of radioactive substances.

Radioactive substances have a variety of applications across different fields. Here are some notable uses:

Medicine:

Diagnostic Imaging: Radioactive tracers, like Technetium-99m, are used in imaging techniques such as PET and SPECT scans to diagnose and monitor diseases.
Radiotherapy: Radioisotopes like Cobalt-60 and Iodine-131 are used in cancer treatment to target and destroy malignant cells.
Industry:

Nuclear Power: Uranium-235 and Plutonium-239 are used as fuel in nuclear reactors to generate electricity.
Radiography: Radioactive isotopes like Iridium-192 and Cobalt-60 are used for inspecting welds and structural integrity of materials through gamma radiography.
Agriculture:

Pest Control: Radioactive isotopes are used to sterilize pests, such as fruit flies, to control agricultural pests and reduce crop damage.
Soil and Crop Research: Isotopes can track nutrient uptake and improve crop yields.
Environmental Science:

Tracer Studies: Radioactive tracers help in studying the movement and distribution of pollutants and understanding ecological processes.
Scientific Research:

Radioactive Dating: Techniques like Carbon-14 dating are used to determine the age of archaeological finds and geological samples.
Consumer Products:

Smoke Detectors: Americium-241 is used in smoke detectors to detect smoke particles and trigger an alarm.
These applications leverage the unique properties of radioactive substances, such as their ability to emit radiation, which can be used for imaging, treatment, or tracing purposes.